Whether you call it a Kite or a 2-String Kite (as I learned), there is a strong link on <1> in [r2] and [c2]. This would normally perform the elimination r8c6<>1, but <1> doesn't exist in r8c6. (Yes, there also happens to be a strong link on <1> in [b1], but that isn't of any consequence to the logic.)